Device and method for detecting vacuum degree of liquid hydrogen double-layer spherical tank

Abstract

The invention relates to the technical field of spherical tank detection, and discloses a liquid hydrogen double-layer spherical tank vacuum degree detection device and method.The vacuum degree detection device comprises a double-layer spherical tank body, and an inner measurement positioning mechanism is arranged in an interlayer of the double-layer spherical tank body; the inner measurement positioning mechanism comprises an inner ring pipe, a plurality of along-seam arms and a vacuum degree detection assembly, the inner ring pipe is fixed in a top interlayer of the double-layer ball tank body, and the along-seam arms are fixedly connected to the lower portion of the inner ring pipe in the extension direction of the longitudinal welding seam and communicate with the inner ring pipe; sensing devices are arranged on each edge seam arm in an array mode, and an air leakage detecting swing ball is hung below each sensing device through a ball pulling vertical rope. The internal measurement positioning mechanism is arranged in the interlayer of the double-layer spherical tank, the swing balls and the sensing device are arranged on the seam arm in an array mode, the swing balls can be triggered to swing through weak airflow disturbance generated by the leakage point, and then the leakage point is accurately captured and positioned through the sensing device.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of spherical tank detection, more particularly, it relates to a liquid hydrogen double-layer spherical tank vacuum degree detection device and method. BACKGROUND

[0002] Liquid hydrogen as a clean energy, usually uses double-layer spherical tank for heat preservation in the storage and transportation process, and the interlayer needs to be kept in a high vacuum state to reduce heat transfer and ensure the ultra-low temperature storage of liquid hydrogen. However, the interlayer of the double-layer spherical tank may leak slightly due to material fatigue, welding defects or external impact during long-term use, resulting in a decrease in vacuum degree.

[0003] In the prior art, the vacuum degree of the interlayer of the double-layer spherical tank is usually detected by using a vacuum gauge for overall monitoring. Although this method can determine whether the vacuum degree is abnormal, it cannot accurately identify the position of the leakage point. When the vacuum degree is detected to decrease, the maintenance personnel need to spend a lot of time and effort to investigate, and even the entire spherical tank may need to be detected in a large range, which is not only low in efficiency, but also high in maintenance cost. Therefore, we propose a liquid hydrogen double-layer spherical tank vacuum degree detection device and method. SUMMARY

[0004] The present application provides a liquid hydrogen double-layer spherical tank vacuum degree detection device and method, which solves the technical problem that in the related art, when the vacuum degree is detected to decrease, the maintenance personnel need to spend a lot of time and effort to investigate, and even the entire spherical tank may need to be detected in a large range.

[0005] The present application provides a liquid hydrogen double-layer spherical tank vacuum degree detection device and method, which solves the technical problem that in the related art, when the vacuum degree is detected to decrease, the maintenance personnel need to spend a lot of time and effort to investigate, and even the entire spherical tank may need to be detected in a large range. The present application provides a liquid hydrogen double-layer spherical tank vacuum degree detection device and method, which solves the technical problem that in the related art, when the vacuum degree is detected to decrease, the maintenance personnel need to spend a lot of time and effort to investigate, and even the entire spherical tank may need to be detected in a large range. Each of the plurality of along-seam arms is provided with a sensor device, and each sensor device is suspended below by a pull ball vertical rope. The vacuum degree detection assembly comprises an intelligent terminal and a vacuum detector, and all the sensor devices are signal-connected to the intelligent terminal. When the interlayer of the double-layer spherical tank body has a gas leakage point, the corresponding gas leakage swing ball is impacted and swung by the airflow, triggering the corresponding sensor device to collect data and transmit the data to the intelligent terminal to accurately locate the leakage point. The intelligent terminal combines the actual measurement value of the vacuum degree of the vacuum detector for double data comparison to avoid false reporting.

[0006] Further, the vacuum degree detection assembly further comprises a general control cabinet, two independent spaces, a general control room and a pump room, are arranged in the general control cabinet, the intelligent terminal is arranged in the general control room, and the vacuum suction pump and the vacuum detection machine are fixedly arranged in the pump room.

[0007] Further, the back of the general control cabinet is provided with a wire passing pipe and a suction pipe, the wire passing pipe and the suction pipe are fixedly connected with an outer ring pipe at the end away from the general control cabinet, the outer ring pipe is arranged at the top periphery of the double-layer spherical tank body, a plurality of wall penetrating pipes are fixedly connected in the outer ring pipe, and the wall penetrating pipes are fixedly provided with plug heads.

[0008] Further, the inner part of the plug head is provided with three holes, namely a pipe passing hole, a wire passing hole and a suction port, the wire distribution pipe is arranged in the pipe passing hole, one end of the wire distribution pipe is fixedly connected with the inner ring pipe in the interlayer of the double-layer spherical tank body and is in communication with each other, the other end of the wire distribution pipe sequentially passes through the wall penetrating pipe, the outer ring pipe and the wire passing pipe, and the inner wall of the pipe passing hole is provided with a plurality of skirt-shaped anti-reflection ring pieces.

[0009] Further, the inner part of the pipe passing hole is provided with a probe line, one end of the probe line is provided with a pressure measuring probe and is arranged in the interlayer of the double-layer spherical tank body, the inner wall of the pipe passing hole is provided with a plurality of skirt-shaped anti-reflection ring pieces, and the other end of the probe line sequentially passes through the wall penetrating pipe, the outer ring pipe and the wire passing pipe and is finally connected with the vacuum detection machine in the pump room.

[0010] Further, the inner part of the suction port is fixedly provided with an electromagnetic valve, and the electromagnetic valve is signal-connected with the intelligent terminal and is controlled thereby.

[0011] Further, a plurality of air passing windows are equidistantly arranged in the inner part of the jointing arm, the sensor device is fixedly arranged at the top of the air passing window, and the air passing windows in the same jointing arm are in communication with each other through the wire passing channel.

[0012] Further, the outer wall of the air leakage swing ball is provided with a plurality of arc-shaped air guide strip grooves and a plurality of thin spring pieces, and the plurality of thin spring pieces are not in contact with the inner wall of the air passing window.

[0013] Further, the connecting end point of the sensor device is fixedly provided with a sensor wire, all the sensor wires are arranged in close contact with the inner wall of the air passing window, and after entering the inner ring pipe along the wire passing channel, the sensor wires are connected with the intelligent terminal.

[0014] The second aspect of the present application provides a method for using the liquid hydrogen double-layer spherical tank vacuum degree detection device, and the method comprises the following steps: S1, the vacuum suction pump and the electromagnetic valve are started, the interlayer air of the double-layer spherical tank body is extracted through the suction port, the vacuum detection machine collects the interlayer vacuum degree data in real time through the pressure measuring probe and transmits the data to the intelligent terminal. S2, when the interlayer vacuum degree reaches the preset value, the intelligent terminal controls the vacuum suction pump to stop working and closes the electromagnetic valve, and maintains the interlayer vacuum state; S3, the intelligent terminal continuously receives the vacuum degree monitoring data of the vacuum detector, and if abnormal change of the vacuum degree is detected, the alarm system is triggered; S4, the airflow disturbance near the leakage point triggers the corresponding leakage detection swing ball to swing, the sensor device collects the vibration signal and locates the leakage position, and the intelligent terminal combines the vacuum degree data and the sensor signal for double verification; S5, after confirming the leakage, the intelligent terminal controls the vacuum suction pump to restart to maintain the interlayer vacuum degree, and sends the leakage point position information to the maintenance personnel at the same time.

[0015] The beneficial effects of the present application are: The present application can trigger the swing of the swing ball by the weak airflow disturbance caused by the leakage point, and then accurately capture and locate the leakage point by the sensor device, so as to solve the problem that the traditional method cannot accurately locate the leakage point. The intelligent terminal combines the vibration signal of the leakage detection swing ball and the actual measurement value of the vacuum degree of the vacuum detector for double data comparison, effectively avoids the false alarm caused by a single data source, and significantly improves the accuracy and reliability of the detection. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is the overall structure schematic diagram of the present application; Figure 2 is the structure schematic diagram of the along-seam arm position of the present application; Figure 3 is the structure schematic diagram of the inner ring pipe of the present application; Figure 4 is the structure schematic diagram of the Figure 3 is the enlarged schematic diagram of A in the present application; Figure 5 is the structure schematic diagram of the air passage window of the present application; Figure 6 is the structure schematic diagram of the total control cabinet of the present application; Figure 7 is the structure schematic diagram of the wall pipe of the present application; Figure 8 is the structure schematic diagram of the pipe plugging head of the present application.

[0017] In the figure: 11. Double-layer spherical tank body; 2. Internal positioning mechanism; 21. Outer ring pipe; 22. Through-wall pipe; 23. Inner ring pipe; 24. Along-seam arm; 25. Branch pipe; 26. Measured air leakage pendulum ball; 27. Air window; 28. Sensor component; 29. ​​Ball-pulling rope; 201. Wire channel; 202. Sensor wire; 203. Thin spring component; 204. Air guide groove; 31. Master control cabinet; 32. Wire pipe; 33. Suction pipe; 34. Probe line; 35. Pressure probe; 36. Master control room; 37. Intelligent terminal; 38. Pump room; 39. Vacuum suction pump; 301. Vacuum testing machine; 41. Pipe plug; 42. Pipe hole; 43. Anti-reflection ring piece 1; 44. Wire hole; 45. Anti-reflection ring piece 2; 46. Suction port; 47. Solenoid valve. DETAILED DESCRIPTION

[0018] The subject matter described herein will now be discussed with reference to exemplary embodiments. It should be understood that these embodiments are discussed solely to enable those skilled in the art to better understand and implement the subject matter described herein, and that the functions and arrangements of the elements discussed may be varied without departing from the scope of this specification. Various examples may omit, substitute, or add various processes or components as needed. In addition, features described with respect to some examples may also be combined in other examples.

[0019] Example 1 like Figure 1 - Figure 8 As shown, a vacuum degree detection device for a liquid hydrogen double-layer spherical tank comprises: a double-layer spherical tank body 11, wherein an internal positioning mechanism 2 is provided in the interlayer of the double-layer spherical tank body 11; The internal positioning mechanism 2 includes an inner ring tube 23, a plurality of seam arms 24 and a vacuum detection assembly. The inner ring tube 23 is fixed in the top interlayer of the double-layer spherical tank body 11, and a plurality of seam arms 24 are fixedly connected to the bottom of the inner ring tube 23 along the longitudinal weld extension direction and communicated with it. Each sensor element 28 is arrayed on the upper side of the seam arm 24, and a deflation detection pendulum ball 26 is suspended below each sensor element 28 via a ball-pulling rope 29; The vacuum detection component includes an intelligent terminal 37 and a vacuum detection machine 301, and all sensor devices 28 are connected to the intelligent terminal 37 for signal connection; When air flow disturbance occurs at the interlayer leakage point of the double-layer spherical tank body 11, the corresponding leakage detection pendulum ball 26 is impacted by the air flow and swings, triggering the corresponding sensor device 28 to collect data and transmit it to the smart terminal 37 to accurately locate the leakage point. The smart terminal 37 performs a double data comparison based on the actual vacuum degree measurement value of the vacuum detection machine 301 to avoid false alarms.

[0020] The vacuum degree detection assembly further comprises a general control cabinet 31, the inside of the general control cabinet 31 is provided with two independent spaces, a general control room 36 and a pump room 38, an intelligent terminal 37 is arranged in the general control room 36, and a vacuum suction pump 39 and a vacuum detection machine 301 are fixedly installed in the inside of the pump room 38, and the intelligent terminal 37 is signal-connected with the vacuum suction pump 39 and the vacuum detection machine 301 respectively.

[0021] The back of the general control cabinet 31 is provided with a wire passing pipe 32 and a suction pipe 33, the wire passing pipe 32 and the suction pipe 33 are fixedly connected with the outer ring pipe 21 at the ends, away from the general control cabinet 31, and the outer ring pipe 21 is arranged at the top periphery of the double-layer spherical tank body 11, a plurality of wall penetrating pipes 22 are fixedly connected in the inside of the outer ring pipe 21, and the wall penetrating pipes 22 are fixedly provided with plug heads 41 in the inside.

[0022] The plug head 41 is provided with three holes in the inside, namely a pipe passing hole 42, a wire passing hole 44 and a suction port 46, the wire passing pipe 25 is arranged in the pipe passing hole 42, one end of the wire passing pipe 25 is fixedly connected with the inner ring pipe 23 in the interlayer of the double-layer spherical tank body 11 and is in communication with each other, the other end of the wire passing pipe 25 sequentially enters the wire passing pipe 32 along the wall penetrating pipe 22 and the outer ring pipe 21, and a plurality of skirt-shaped anti-reflection ring pieces one 43 are arranged on the inner wall of the pipe passing hole 42.

[0023] The inside of the wire passing hole 44 is provided with a probe wire 34, one end of the probe wire 34 is provided with a pressure measuring probe 35 and is arranged in the interlayer of the double-layer spherical tank body 11, a plurality of skirt-shaped anti-reflection ring pieces two 45 are arranged on the inner wall of the wire passing hole 44, and the other end of the probe wire 34 sequentially enters the wire passing pipe 32 along the wall penetrating pipe 22 and the outer ring pipe 21 and finally enters the pump room 38 and is connected with the vacuum detection machine 301.

[0024] The inside of the suction port 46 is fixedly provided with an electromagnetic valve 47, the electromagnetic valve 47 is signal-connected with the intelligent terminal 37 and is controlled thereby.

[0025] A plurality of air passing windows 27 are equidistantly arranged in the inside of the slitting arm 24, a sensor device 28 is fixedly arranged on the top of the air passing window 27, and the air passing windows 27 in the same slitting arm 24 are in communication with each other through a wire passing channel 201.

[0026] The outer wall of the air leakage swing ball 26 is provided with a plurality of arc-shaped air guide strip grooves 204 and a plurality of thin spring pieces 203, and the plurality of thin spring pieces 203 are not in contact with the inner wall of the air passing window 27.

[0027] The connecting end point of the sensor device 28 is fixedly provided with a sensor wire 202, all the sensor wires 202 are arranged in close contact with the inner wall of the air passing window 27 and enter the inner ring pipe 23 along the wire passing channel 201 and are connected with the intelligent terminal 37.

[0028] In use, first, the intelligent terminal 37 controls the vacuum suction pump 39 and the electromagnetic valve 47 to work simultaneously, with the working of the vacuum suction pump 39, the air in the interlayer of the double-layer spherical tank body 11 is gradually extracted along the suction port 46, the through-wall pipe 22 and the suction pipe 33, at the same time, the vacuum detection machine 301 detects data through multiple pressure measuring probes 35 in the interlayer of the double-layer spherical tank body 11 and transmits the data to the intelligent terminal 37, when the air pressure in the interlayer of the double-layer spherical tank body 11 reaches a specified value, the intelligent terminal 37 controls the vacuum suction pump 39 to stop working and controls the electromagnetic valve 47 to block the suction port 46 to prevent leakage.

[0029] Then the intelligent terminal 37 continues or schedules the vacuum detection machine 301 according to the preset program, and transmits the data to the intelligent terminal 37 in real time, if the vacuum degree data changes, an alarm will be sent to remind the staff to repair.

[0030] When the vacuum suction pump 39 extracts the air in the interlayer of the double-layer spherical tank body 11, with the gradual vacuum in the interlayer of the double-layer spherical tank body 11, the flexible blocking ring 43 and the blocking ring 45 adaptively fit the branch pipe 25 and the probe line 34 under pressure, thereby achieving multiple sealing effects.

[0031] All sensor wires 202 of the sensor device 28 are finally collected in the branch pipe 25, and the branch pipe 25 has a connector, and after the connector is connected with the sensor wire 202, the branch pipe 25 is still in a sealed state and will not cause leakage, and finally the signal is transmitted to the intelligent terminal 37.

[0032] When the vacuum degree in the interlayer of the double-layer spherical tank body 11 remains at a specified value, the airflow in the interlayer remains stable, and there is no disturbance of the airflow, and all the leak detection pendulums 26 remain stable under the action of gravity, if the interlayer of the double-layer spherical tank body 11 leaks, air will enter the interlayer of the double-layer spherical tank body 11 from the leakage point under the strong suction of the vacuum, at this time, the airflow near the leakage point will be disturbed first, and the leak detection pendulum 26 closest to the leakage point will be swung or shaken, at this time, the shaking of the leak detection pendulum 26 will be sensed by the corresponding sensor device 28, thereby the data is transmitted to the intelligent terminal 37 in the first time, and the corresponding position diagram of the sensor device 28 will be displayed on the display screen of the intelligent terminal 37, at this time, the staff can timely and accurately find the leakage point.

[0033] When the leak detection pendulum 26 swings, the pressure measuring probe 35 of the vacuum detection machine 301 also detects the change of the vacuum degree data in the interlayer of the double-layer spherical tank body 11, the intelligent terminal 37 comprehensively processes the vacuum degree data in the interlayer of the double-layer spherical tank body 11 and the data of the sensor device 28 to judge whether leakage occurs, under the double action, false reporting is prevented.

[0034] When the intelligent terminal 37 judges that the leakage actually occurs, the alarm is sent in time, and the vacuum suction pump 39 is controlled to work in time to continuously extract the air in the interlayer of the double-layer spherical tank body 11, so that the vacuum degree can be kept in an acceptable range before maintenance.

[0035] All the along-weld arms 24 are arranged along the welds, because the welds of the double-layer spherical tank body 11 are most prone to leakage; The design of the air guide strip groove 204 can increase the force of the gas disturbance on the leakage detection pendulum ball 26, and the thin spring member 203 increases the vibration sensitivity of the leakage detection pendulum ball 26. In the state that the leakage detection pendulum ball 26 does not reach the shaking state, the small air flow disturbance can drive the vibration of the thin spring member 203.

[0036] The inner measurement positioning mechanism 2 is arranged along the longitudinal welds and the along-weld arms 24, so that accurate detection can be realized for the weld area of the double-layer spherical tank body 11 which is most prone to leakage, and the leakage positioning efficiency is improved; The leakage detection pendulum ball 26 is hung through the pull ball vertical rope 29, and the air guide strip groove 204 enhances the air flow force, and the thin spring member 203 enhances the vibration sensitivity, so that the rapid response of the small leakage can be realized; The vacuum detection assembly adopts the double data comparison mechanism of the intelligent terminal 37 and the vacuum detection machine 301, so that the false alarm caused by a single data source is avoided, and the detection accuracy is improved; The through-wall pipe 22 is adapted to the branch pipe 25 and the probe line 34 through the skirt-shaped blocking ring piece one 43 and the blocking ring piece two 45, so that multiple dynamic seals are formed, and the vacuum leakage is prevented; The along-weld arm 24 is connected through the air passing window 27 and the wire passing channel 201, the sensor lead 202 is arranged along the inner wall and gathered in the branch pipe 25, so that the line sealing property and the signal transmission stability are ensured; The total control cabinet 31 is partitioned into the total control room 36 and the pump room 38, so that the independent operation and the cooperative control of the intelligent terminal 37, the vacuum suction pump 39 and the vacuum detection machine 301 are realized, and the system reliability is ensured; The electromagnetic valve 47 is accurately controlled by the intelligent terminal 37, the suction port 46 is blocked after the vacuum extraction is completed, the external air backflow is prevented, and the interlayer vacuum degree is maintained stable.

[0037] Embodiment 2 A method for detecting the vacuum degree of a liquid hydrogen double-layer spherical tank, comprising the following steps: S1, starting the vacuum suction pump 39 and the electromagnetic valve 47, extracting the air in the interlayer of the double-layer spherical tank body 11 through the suction port 46, and collecting the interlayer vacuum degree data in real time by the vacuum detection machine 301 and transmitting the data to the intelligent terminal 37; S2, when the interlayer vacuum reaches a preset value, the intelligent terminal 37 controls the vacuum pump 39 to stop working and closes the electromagnetic valve 47, maintaining the interlayer vacuum state; S3, the intelligent terminal 37 continuously receives the vacuum monitoring data of the vacuum detector 301, and if the vacuum changes abnormally, the alarm system is triggered; S4, the airflow disturbance near the leakage point triggers the corresponding leak detection swing ball 26 to swing, the sensor 28 collects the vibration signal and locates the leakage position, and the intelligent terminal 37 combines the vacuum data and the sensor signal for double verification; S5, after confirming the leakage, the intelligent terminal 37 controls the vacuum pump 39 to restart to maintain the interlayer vacuum, and sends the leakage point position information to the maintenance personnel at the same time.

[0038] The embodiments of the present application are described above, but the present application is not limited to the specific embodiments described above, and the specific embodiments described above are only illustrative but not restrictive, and those skilled in the art can make many forms under the inspiration of the present embodiment, which all belong to the protection of the present embodiment.

Claims

1. A vacuum degree detection device for a liquid hydrogen double-layer spherical tank, characterized in that: include: A double-layer spherical tank body (11), wherein an internal positioning mechanism (2) is provided in an interlayer of the double-layer spherical tank body (11); The internal positioning mechanism (2) comprises an inner ring tube (23), a plurality of seam-side arms (24) and a vacuum detection assembly, wherein the inner ring tube (23) is fixed in the top interlayer of the double-layer spherical tank body (11), and the plurality of seam-side arms (24) are fixedly connected to the bottom of the inner ring tube (23) along the longitudinal weld extension direction and communicated with the inner ring tube (23); Each of the above-mentioned sensors (28) is arranged in an array on the seam arm (24), and a deflation measuring pendulum ball (26) is suspended below each sensor (28) via a ball-pulling rope (29); The vacuum detection component includes an intelligent terminal (37) and a vacuum detection machine (301), and all sensor devices (28) are connected to the intelligent terminal (37) via signals; When the airflow disturbance occurs at the interlayer leakage point of the double-layer spherical tank body (11), the corresponding leakage detection pendulum ball (26) is impacted by the airflow and swings, triggering the corresponding sensor device (28) to collect data and transmit it to the intelligent terminal (37) to accurately locate the leakage point. The intelligent terminal (37) performs a double data comparison with the actual vacuum value measured by the vacuum detection machine (301) to avoid false alarms.

2. A liquid hydrogen double-layer spherical tank vacuum detection device according to claim 1, characterized in that: The vacuum detection component further includes a master control cabinet (31), wherein the master control cabinet (31) is provided with two independent spaces, a master control room (36) and a pump room (38), wherein the intelligent terminal (37) is arranged in the master control room (36), and a vacuum suction pump (39) and a vacuum detection machine (301) are fixedly installed in the pump room (38), and the intelligent terminal (37) is respectively connected to the vacuum suction pump (39) and the vacuum detection machine (301) for signal communication.

3. A liquid hydrogen double-layer spherical tank vacuum detection device according to claim 2, characterized in that: A wire-passing pipe (32) and a suction pipe (33) are provided on the back of the master control cabinet (31). One end of the wire-passing pipe (32) and the suction pipe (33) away from the master control cabinet (31) is fixedly connected to an outer ring pipe (21). The outer ring pipe (21) is provided on the outer periphery of the top of the double-layer spherical tank (11). A plurality of through-wall pipes (22) are fixedly connected to the inner side of the outer ring pipe (21). A pipe plug (41) is fixedly provided inside the through-wall pipe (22).

4. A liquid hydrogen double-layer spherical tank vacuum detection device according to claim 3, characterized in that: The pipe plug (41) is provided with three holes inside, namely a pipe hole (42), a wire hole (44) and a suction port (46). A branch pipe (25) is passed through the pipe hole (42). One end of the branch pipe (25) is fixedly connected to the inner ring pipe (23) in the interlayer of the double-layer spherical tank body (11) and is interconnected. The other end of the branch pipe (25) enters the wire pipe (32) along the through-wall pipe (22) and the outer ring pipe (21) in sequence. The inner wall of the pipe hole (42) is provided with a plurality of skirt-shaped anti-reflection ring pieces (43).

5. A liquid hydrogen double-layer spherical tank vacuum detection device according to claim 4, characterized in that: A probe wire (34) is passed through the wire hole (44), one end of the probe wire (34) is provided with a pressure probe (35) and is located in the interlayer of the double-layer spherical tank body (11). The inner wall of the wire hole (44) is provided with a plurality of skirt-shaped anti-reflection ring pieces (45). The end of the probe wire (34) away from the pressure probe (35) enters the wire pipe (32) along the through-wall pipe (22) and the outer ring pipe (21) in sequence, and finally enters the pump chamber (38) and is connected to the vacuum detection machine (301).

6. A liquid hydrogen double-layer spherical tank vacuum detection device according to claim 4, characterized in that: A solenoid valve (47) is fixedly provided inside the suction port (46), and the solenoid valve (47) is connected to the intelligent terminal (37) by signal and is controlled thereby.

7. The vacuum degree detection device for a liquid hydrogen double-layer spherical tank according to claim 1 is characterized in that: The internal equidistant array of the slot arm (24) has a plurality of air windows (27), the sensor device (28) is fixed on the top of the air window (27), and the air windows (27) in the same slot arm (24) are connected to each other through the wire channel (201).

8. A liquid hydrogen double-layer spherical tank vacuum detection device according to claim 7, characterized in that: The outer wall of the air leakage detection pendulum ball (26) is provided with a plurality of arc-shaped air guide grooves (204) and a plurality of thin spring members (203), and the plurality of thin spring members (203) are not in contact with the inner wall of the air window (27).

9. The vacuum degree detection device for a liquid hydrogen double-layer spherical tank according to claim 7 is characterized in that: The connection end of the sensor element (28) is fixedly provided with a sensor wire (202). All the sensor wires (202) are closely attached to the inner wall of the air window (27) and are connected to the intelligent terminal (37) after entering the inner ring tube (23) along the wire path (201).

10. A method for using the vacuum degree detection device for a liquid hydrogen double-layer spherical tank according to any one of claims 1 to 9, characterized in that: The steps include: S1, start the vacuum suction pump (39) and the electromagnetic valve (47), extract the interlayer air of the double-layer spherical tank (11) through the suction port (46), and the vacuum detection machine (301) collects the interlayer vacuum degree data in real time through the pressure measuring probe (35) and transmits it to the intelligent terminal (37); S2. When the vacuum degree of the interlayer reaches a preset value, the intelligent terminal (37) controls the vacuum suction pump (39) to stop working and closes the solenoid valve (47) to maintain the vacuum state of the interlayer; S3, the intelligent terminal (37) continuously receives the vacuum degree monitoring data from the vacuum detection machine (301), and triggers the alarm system if an abnormal change in the vacuum degree is detected; S4, the air flow disturbance near the leakage point triggers the corresponding leakage detection pendulum ball (26) to swing, the sensor (28) collects the vibration signal and locates the leakage position, and the intelligent terminal (37) combines the vacuum data and the sensor signal for double verification; S5. After confirming the leak, the intelligent terminal (37) controls the vacuum suction pump (39) to restart to maintain the vacuum degree of the interlayer, and simultaneously sends the leak point location information to the maintenance personnel.

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